He thought the stone he stood on moved and he cautiously took a heavier strain on his arm.

He could get across, but he obeyed an impulse and gave the stone a push.

It rolled out and, when he swung himself back to the ledge, plunged down and smashed upon the rocks below.

For a few moments the echoes rolled about the crags, and then Hyslop shouted: "Are you all right?
Can you get round ?" Lister said he thought not, and Hyslop replied that it did not matter.
Barbara would take him up a grassy ridge and the others would meet them at the top.

A rattle of nailed boots indicated that he was going off and Lister turned and glanced at Barbara.